Research Article
Subcritical Water Extraction of Chlorella pyrenoidosa: Optimization through Response Surface Methodology
Table 4
Selection of a suitable model for the SCW system (fit summary).
| Source | Sum of squares | d.f. | Mean square | F | P > F | Remark |
| Sequential model sum of squares | Mean | 0.051 | 1 | 0.051 | | | | Linear | 0.018 | 3 | 6.105E-003 | 26.62 | < 0.0001 | Suggested | 2FI | 7.103E-004 | 3 | 2.368E-004 | 1.04 | 0.4075 | | Quadratic | 1.463E-003 | 3 | 4.877E-004 | 3.26 | 0.0680 | Suggested | Cubic | 1.221E-003 | 5 | 2.443E-004 | 4.43 | 0.0639 | Aliased | Residual | 2.754E-004 | 5 | 5.509E-005 | | | | Total | 0.073 | 20 | 3.642E-003 | | | | Lack-of-fit tests | Linear | 3.395E-003 | 11 | 3.086E-004 | 5.60 | 0.0350 | Suggested | 2FI | 2.684E-003 | 8 | 3.356E-004 | 6.09 | 0.0311 | | Quadratic | 1.221E-003 | 5 | 2.443E-004 | 4.43 | 0.0639 | Suggested | Cubic | 0.000 | 0 | | | | Aliased | Pure Error | 2.754E-004 | 5 | 5.509E-005 | | | | Model Summary statistics | Source | S.D. | R2 | Adj. R2 | Pre. R2 | PRESS | Remark | Linear | 0.015 | 0.8331 | 0.8018 | 0.7157 | 6.251E-003 | Suggested | 2FI | 0.015 | 0.8654 | 0.8032 | 0.5914 | 8.984E-003 | | Quadratic | 0.012 | 0.9319 | 0.8707 | 0.5038 | 0.011 | Suggested | Cubic | 7.422E-003 | 0.9875 | 0.9524 | | | Aliased |
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